1824 fix min max

[MarquisTheCoder]

What does this change

I rounded the min/max values in the pydecimal function definition

# line: 254 file:providers/python/__init__.py
def pydecimal(
        self,
        left_digits=None,
        right_digits=None,
        positive=False,
        min_value=None,
        max_value=None,
    ):
        """ returns valid decimal when given floating point numbers without changing too much code"""
        min_value = round(min_value)
        max_value = round(max_value)

What was wrong

As stated in issue 1824 when a developer inserts a floating point into the min or max value
this conflicts with pythons in-built randrange function.
#1824

How this fixes it

simple fix just rounds the number of the min or max value because they don't need
to be floating points for this function to work in an consistent manner.

Fixes #...
1824

[stefan6419846]

Could you please add a corresponding test as well and fix the formatting issues detected by black?